<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>

  <style>
    html,
    body {
      margin: 0;
      padding: 0;
      width: 100%;
      height: 100%;
    }

    body {

      display: flex;
      justify-content: center;
      align-items: center;
    }

    .content {



      width: 200px;
      height: 200px;
      background: #262626;
    }
  </style>
</head>

<body>
  <div class="content">

  </div>
</body>

</html>